I had some fun making this image, and doing the research for it too. Because Tyrannosaurus Rex was one of the most common large predators in what is now North America, a lot of fossil remains have been found. And because the skeleton exhibited growth rings in some bones (and had other signs where those bones were not part of a find) the ages at which they died is often clear. This has allowed Palaeontologists to study Tyrannosaurus growth patterns, something that can't be done with many dinosaurs because too few examples have been found. So here with the usual 1.85m tall Genesis 8 Male — six feet tall for some of us — is a family of Tyrannosaurus on a walk. You can see an egg, a hatchling, a juvenile and two adults, all roughly matched in size to fossilised remains described by researchers. Tyrannosaurus actually laid the largest eggs of any dinosaur for which fossilised eggs have been found. From the numbers found they laid a lot of eggs too. The eggs were about 50cm (20 inches) long and 20cm (8 inches) in diameter and had extremely thick, tough shells. Tyrannosaurus grew steadily from hatching until they were somewhere around 12 to 15 years old, reaching a maximum of about 1,800Kg (3,968lbs US) during this period. As they approached sexual maturity they then had an extreme growth spurt, probably adding over 1,700Kg (3,747lbs US) each year for several years, gradually slowing down as they approached 5,000 to 8,000Kg (roughly 11,000-17,600lbs US) and 20-25 years of age. They continued to grow throughout their lives but rarely reached more than an estimated 6,500-8,500Kg (14,330-18,739lbs US) at death at around 30-35 years. The thing that struck me most looking at this render was the extreme size difference between the hatchling and the fully grown adults. Those adults are at least 3,500 times heavier...